1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ikadub [295]
3 years ago
14

37,38 asap help show work

Chemistry
1 answer:
OLEGan [10]3 years ago
8 0

Answer:  see below

<u>Explanation:</u>

When multiplying or dividing, use the smallest number of significant figures (sf) of the digits provided.

37(a) 24 × 3.26 = 78.24      <em>2 sf × 3 sf </em>-->  round to 2 sf's

                          ≈ 78

   (b) 120 × 0.10 = 12            <em>2 sf × 2 sf </em>-->  round to 2 sf's

                          = 12

   (c) 1.23 × 2.0 = 2.46            <em>3 sf × 2 sf </em>-->  round to 2 sf's

                          = 2.5

    (d) 53 × 1.53 = 81.09            <em>2 sf × 3 sf </em>-->  round to 2 sf's

                          = 81

38(a)  4.84 ÷ 2.4 = 2.0167           <em>3 sf × 2 sf </em>-->  round to 2 sf's

                          = 2.0

   (b)  60.2 ÷ 20.1 = 2.995         <em>3 sf × 3 sf </em>-->  round to 3 sf's

                            = 3.00

    (c) 102.4 ÷ 51.2 = 2               <em>4 sf × 3 sf </em>-->  round to 3 sf's

                          = 2.00

    (d) 168 ÷ 58 = 2.896                  <em>3 sf × 2 sf </em>-->  round to 2 sf's

                          = 2.9

 

You might be interested in
How much energy is required to vaporize 0.5kg of water?
White raven [17]

Answer:

Explanation:

Vaporization Equation => Q = m·ΔHv

m = 0.5Kg water = 500g water

ΔHv = Heat of vaporization = 540 calories/gram

∴Q = 500g x 540cal/g = 270,000 calories x 4.184 joules/cal = 1,129,680 joules = 1130 Kilojoules (3 sig. figs.)

3 0
3 years ago
How many Joules of heat are released from a 400g piece of glass that has been cooled
Aleonysh [2.5K]

Answer:

400 × 22 × 0.664 = 5843.2 J

4 0
2 years ago
Which statement describes a change that occurs during a chemical reaction? A. Atoms in the original substances are changed into
trapecia [35]

Answer:

B. Atoms in the original substances are arranged in a different way to make new substances.

Explanation:

The best statement that describes a change that occurs in a chemical reaction is that atoms in the original substances are arranged in a different way to make new substances.

  • Chemical reactions obey the law of conservation of matter.
  • The law postulates that "matter is neither created nor destroyed in a chemical reaction but they are simply rearranged".
  • Therefore, atoms  of compounds forms new bonds by rearranging to give a new product.
6 0
3 years ago
Read 2 more answers
Describe one advantage and one disadvantage of replacing standard bulbs with led lighting
Leno4ka [110]
Advantages

less wasted energy

Reduces fossilisation

Disadvantages

- Expensive

- doesn't look nice ( apparently)



7 0
3 years ago
The pH of a neutral solution is below 7 above 7 7 7.5
morpeh [17]
The pH scale ranges from 0 to 14 and goes from acidic to alkaline, where 7 - the center of the scale - is the most neutral.

Answer:
The pH of a neutral solution is exactly 7.
4 0
3 years ago
Other questions:
  • What is the difference between alectronegativity and ioniztion energy
    8·1 answer
  • Which of the following best describes a pair of elements that will form an ionic bond?
    11·2 answers
  • How many atoms of phosphorus are in 4.50 mol of copper(ii) phosphate?
    9·2 answers
  • How much iron can be recovered from 25 grams of Fe2O3
    14·2 answers
  • Where is carbon found on earth? <br><br> ( short answer please )
    5·2 answers
  • How does the mass and size of an atom compare to the mass and size of the nucleus
    5·2 answers
  • . Now Sara comes along, and she is the exact same size as you. However, she is even stronger than you are! When she pulls you in
    5·1 answer
  • Question 2
    15·1 answer
  • Which of the following is a correctly written electron configuration?
    9·1 answer
  • what are the differences between the double displacement reaction and the displacement reaction ? explain with a chemical equati
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!